[fdo-trac] #686: Enhance WMS exception format parameter setting way in GetMap request

[FDO]

#686: Enhance WMS exception format parameter setting way in GetMap request
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   Reporter:  leodai        |       Owner:  Leo Dai
       Type:  enhancement   |      Status:  new    
   Priority:  major         |   Milestone:  3.6.0  
  Component:  WMS Provider  |     Version:  3.4.0  
   Severity:  3             |    Keywords:         
External_id:                |  
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 Currently, because some WMS servers do not correctly default to using the
 xml service exception report, we hard-coded to xml while sending GetMap
 request.

 The improvement we can do is: we made an enhancement to it: first, we will
 read the server supported exception format while parsing the capability
 document. Second, we will check whether server support XML format while
 sending GetMap request, if not, use the first format provided in the
 capability document.

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/686>
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